Interesting. One of the origins of JS was as the system programming language in Netscape Web Servers. Certainly had a different name at some point, whose relics remain. I'm trying to remember what JS used to be called before they put Java into the name to introduce a little brand confusion. Should be readily retrieved, and that might be the kind of clue that might help you break into that application domain. [I tried a while back, but I don't remember much progress.] Maybe you'll need to install Netscape Server to have access to full JS scripting? :P
--Don Ellis On Thu, Mar 26, 2009 at 4:33 PM, Robert Citek <[email protected]>wrote: > > w3schools seems to be mainly focused on using JS within a web browser. > I'm experimenting to see if JS can be used as a general-purpose > scripting language like perl, ruby, python, bash, etc. Judging from > my Googling, I am suspecting that it cannot, or at least not easily. > The biggest challenge seems to be anything system oriented: file I/O, > system calls, DB connections, etc. > > Simple stuff seems to work well enough. For example, this works: > > $ js -e 'print("Hello, world");' > Hello, world > > As does this when saved as hw.js and permissions changed to +x: > > $ cat hw.js > #!/usr/bin/env js > print("Hello, world") ; > > $ ./hw.js > Hello, world > > But there does not seem to be any JS way of doing the equivalent of this: > > #!/usr/bin/env perl > open(FOO, "seq 1 10|") ; > @lines=<FOO>; > chomp(@lines) ; > print join("\t", @lines)."\n" ; > > Or is there? > > Regards, > - Robert > > On Thu, Mar 26, 2009 at 2:07 PM, Don Ellis <[email protected]> wrote: > > Check out this series (unit on JS): > > http://www.w3schools.com/js/default.asp > > > > I've played around with some of their other tutorials, and was fairly > > impressed, though I'd like to go a bit deeper. Nice thing about the > > tutorials is they are hands on and live. Type in a CSS or HTML (or JS) > > expression, and it's evaluated right there. > > Let me know what you think. > > --Don Ellis > > > > > > On Thu, Mar 26, 2009 at 1:54 PM, Robert Citek <[email protected]> > > wrote: > >> > >> Can anyone recommend a good tutorial for using JavaScript at the command > >> line? > >> > >> Most JavaScript (JS) tutorials are written for using JS within a > >> browser. But JS can also be used from the command line if you install > >> the stand-alone JS interpreter Spidermonkey: > >> > >> $ sudo apt-get install spidermonkey-bin > >> > >> The canonical simple example: > >> > >> $ js -e 'print("Hello, world") ;' > >> Hello, world > >> > >> And a simple line numbering loop: > >> > >> $ yes "Hello, world" | head | js -e 'var count=0 ; while > >> (line=readline()) { count++ ; print(count, ": ", line) ; } ' > >> 1 : Hello, world > >> 2 : Hello, world > >> 3 : Hello, world > >> 4 : Hello, world > >> 5 : Hello, world > >> 6 : Hello, world > >> 7 : Hello, world > >> 8 : Hello, world > >> 9 : Hello, world > >> 10 : Hello, world > >> > >> Unfortunately, it took me a bit of digging and guessing to find out > >> how to do even those simple examples. For example, the readline() > >> function isn't even mentioned in the "Javascript: the Definitive > >> Guide" book. I stumbled upon that by looking at this Mozilla page: > >> > >> https://developer.mozilla.org/en/Introduction_to_the_JavaScript_shell > >> > >> What I'm looking for is more in line with this tutorial on awk, a > >> series of one- or two-liners that get across the basic functionality > >> of the language: > >> > >> http://www.vectorsite.net/tsawk_1.html#m2 > >> > >> I'm still Googling, but can anyone recommend a good JS or Spidermonkey > >> tutorial? > >> > >> Regards, > >> - Robert > > > > > > > > > > > > > --~--~---------~--~----~------------~-------~--~----~ Central West End Linux Users Group (via Google Groups) Main page: http://www.cwelug.org To post: [email protected] To subscribe: [email protected] To unsubscribe: [email protected] More options: http://groups.google.com/group/cwelug -~----------~----~----~----~------~----~------~--~---
